Command Line Fundamentals电子书

Preface

About the Book

About the Author

Objectives

Audience

Approach

Hardware Requirements

Software Requirements

Installation and Setup

Guidelines and Tips for using the VM

Installing the Code Bundle

Conventions

Additional Resources

Introduction to the Command Line

Introduction

Command Line: History, Shells, and Terminology

History of the Command Line

Command-Line Shells

Command-Line Terminology

Exploring the Filesystem

Filesystems

Navigating Filesystems

Exercise 1: Exploring Filesystem Contents

Manipulating a Filesystem

Exercise 2: Manipulating the Filesystem

Activity 1: Navigating the Filesystem and Viewing Files

Activity 2: Modifying the Filesystem

Shell History Recall, Editing, and Autocompletion

Command History Recall

Exercise 3: Exploring Shell History

Command-Line Shortcuts

Exercise 4: Using Shell Keyboard Shortcuts

Command-Line Autocompletion

Exercise 5: Completing a Folder Path

Exercise 6: Completing a Command

Exercise 7: Completing a Command using Options

Activity 3: Command-Line Editing

Shell Wildcards and Globbing

Wildcard Syntax and Semantics

Wildcard Expansion or Globbing

Exercise 8: Using Wildcards

Activity 4: Using Simple Wildcards

Activity 5: Using Directory Wildcards

Summary

Command-Line Building Blocks

Introduction

Redirection

Input and Output Streams

Use of Operators for Redirection

Using Multiple Redirections

Heredocs and Herestrings

Buffering

Exercise 9: Working with Command Redirection

Pipes

Exercise 10: Working with Pipes

Text-Processing Commands

Shell Input Concepts

Filtering Commands

Exercise 11: Working with Filtering Commands

Transformation Commands

Exercise 12: Working with Transformation Commands

Activity 6: Processing Tabular Data – Reordering Columns

Activity 7: Data Analysis

Summary

Advanced Command-Line Concepts

Introduction

Command Lists

Command List Operators

Using Multiple Operators

Command Grouping

Exercise 13: Using Command Lists

Job Control

Keyboard Shortcuts for Controlling Jobs

Commands for Controlling Jobs

Regular Expressions

Elements

Quantifiers

Anchoring

Subexpressions and Backreferences

Exercise 14: Using Regular Expressions

Activity 8: Word Matching with Regular Expressions

Shell Expansion

Environment Variables and Variable Expansion

Arithmetic Expansion

Brace Expansion

Recursive Expansion with eval

Command Substitution

Process Substitution

Exercise 15: Using Shell Expansions

Activity 9: String Processing with eval and Shell Expansion

Summary

Shell Scripting

Introduction

Conditionals and Loops

Conditional Expressions

Conditional Statements

Loops

Loop Control

Shell Functions

Function Definition

Function Arguments

Return Values

Local Variables, Scope, and Recursion

Exercise 16: Using Conditional Statements, Loops, and Functions

Shell Line Input

Line Input Commands

Internal Field Separator

Exercise 17: Using Shell Input Interactively

Shell Scripts

Shell Command Categories

Program Launch Process

Script Interpreters

Practical Case Study 1: Chess Game Extractor

Understanding the Problem

Exercise 18: Chess Game Extractor – Parsing a PGN File

Exercise 19: Chess Game Extractor – Extracting a Desired Game

Refining Our Script

Exercise 20: Chess Game Extractor – Handling Options

Adding Features

Exercise 21: Chess Game Extractor – Counting Game Moves

Tips and Tricks

Suppressing Command Output

Arithmetic Expansion

Declaring Typed Variables

Numeric for Loops

echo

Array Reverse Indexing

shopt

Extended Wildcards

man and info Pages

shellcheck

Activity 10: PGN Game Extractor Enhancement

Practical Case Study 2: NYC Yellow Taxi Trip Analysis

Understanding the Dataset

Exercise 22: Taxi Trip Analysis – Extracting Trip Time

Exercise 23: Taxi Trip Analysis – Calculating Average Trip Speed

Exercise 24: Taxi Trip Analysis – Calculating Average Fare

Activity 11: Shell Scripting – NYC Taxi Trip Analysis

Summary

Appendix

Chapter 1: Introduction to the Command Line

Activity 1: Navigating the Filesystem and Viewing Files

Activity 2: Modifying the Filesystem

Activity 3: Command-Line Editing

Activity 4: Using Simple Wildcards

Activity 5: Using Directory Wildcards

Chapter 2: Command-Line Building Blocks

Activity 6: Processing Tabular Data – Reordering Columns

Activity 7: Data Analysis

Chapter 3: Advanced Command-Line Concepts

Activity 8: Word Matching with Regular Expressions

Activity 9: String Processing with eval and Shell Expansion

Chapter 4: Shell Scripting

Activity 10: PGN Game Extractor Enhancement

Activity 11: Shell Scripting – NYC Taxi Trip Analysis